RBG-21-567, Advises That Concern in IE Info Notice 85-09 Not Applicable at Facility,In Response to NRC 850409 Request.Design Includes Remote Shutdown Circuits Separately Fused & Isolated from Main Control Room Circuits

Advises That Concern in IE Info Notice 85-09 Not Applicable at Facility,In Response to NRC 850409 Request.Design Includes Remote Shutdown Circuits Separately Fused & Isolated from Main Control Room Circuits

ML20132C555
Person / Time
Site:	River Bend
Issue date:	07/19/1985
From:	Booker J GULF STATES UTILITIES CO.
To:	Harold Denton Office of Nuclear Reactor Regulation
References
IEIN-85-09, IEIN-85-9, RBG-21-567, NUDOCS 8507300359
Download: ML20132C555 (4)

Text

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t OVLF STATES UTILITIES COMPANY AlvER BENO STAfiON Post OFFICE 80x 220 si FRANCISVILLE, Lout $1ANA 70776 AAEA CODE 604 836 8094 344 8651 July 19, 1985 RBG- 21,567 File No. G9.5 Mr. Harold R. Denton, Director Offico of Nuclear Reactor Regulation U.S. Nuclear Regulatory Ccmnission Washington, D.C. 20555 Dear Mr. Dentont River Bend Station - Unit 1 Docket No. 50-458 In response to a Staff requent dated April 9,1985, Gulf States Utili-ties has reviewed IE Information Notice No. 85-09. The corcern identified therein is not applicable at River Bend Station (RDS). % o RBS design includes rcnoto shutdown circuits which are separately fused and isolated frcm main control rocm circuits in order to safely shutdown the plant in the event of a main control rocm fire. % is information will be clarified in the Final Safety Analysis Report as attached in a future amendment.

Sincerely, f.E. Booker J

. e. W fianager-Engineering, Nuclear Fuoln & Licensing River Bond Nuclear Group JED/ ERG /jo Attachment 5 50 G YDR \\

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ATTACHMENT Included are:

1) Revised FSAR Page 7.4-7a from Amendrnent 20,

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2) Typical circuit which indicates independent fusing and power supplies described in FSAR revision, 8-t

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. RBS FSAR and isolated.

i ttl without actuation of the transfer switches.

and control logic are -e4ee- transferred Power supplies 2: n: 1-

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Access to the remote shutdown panel is administratively and procedurally controlled via the plant security system.

20 Local transfer switch positions are monitored via remote an-l nunciation in the main control room, while proper system j lineup (local control switches) is monitored via remote

! indication at the RSS Division I panel. Controls and 1he isolated Division I and III control logic circuits required to shutdown the plant in the event of a main control room fire are furnished power from independently fused power supplies. J l

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Amendment 20 7.4-7a June 1985 l

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